Pronunciation: (trī-fôr'ē-um, -fōr'-), [key]
—pl. -fo•ri•aPronunciation: (-fôr'ē-u, -fōr'-). [key] Archit.
(in a church) the wall at the side of the nave, choir, or transept, corresponding to the space between the vaulting or ceiling and the roof of an aisle, often having a blind arcade or an opening in a gallery.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.